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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net income | $ 5.0 | $ 6.7 | $ 28.8 | $ 23.3
Other comprehensive income: |  |  |  |
Change in unrealized net gain on investment |  |  |  | (1.5)
Comprehensive income | $ 5.0 | $ 6.7 | $ 28.8 | $ 21.8

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